HR: 0830h
AN: B51E-1014    [PDF]
TI: Remote sensing of net ecosystem productivity based on component spectrum and soil respiration observation in boreal forest, interior Alaska.
AU: * Kushida, K
EM: kkushida@pop.lowtem.hokudai.ac.jp
AF: Institute of Low Temperature Science, Hokkaido University, W8 N19, Kita-ku, Sapporo, 060-0819 Japan
AU: Kim, Y
EM: kimyw@iarc.uaf.edu
AF: Frontier Observational Research System for Global Change (FORSGC), International Arctic Research Center (IARC), University of Alaska Fairbanks, 930 Koyukuk Dr., Fairbanks, AK 99775-7335 United States
AU: Tanaka, N
EM: norit@iarc.uaf.edu
AF: Frontier Observational Research System for Global Change (FORSGC), International Arctic Research Center (IARC), University of Alaska Fairbanks, 930 Koyukuk Dr., Fairbanks, AK 99775-7335 United States
AU: Fukuda, M
EM: mfukuda@pop.lowtem.hokudai.ac.jp
AF: Institute of Low Temperature Science, Hokkaido University, W8 N19, Kita-ku, Sapporo, 060-0819 Japan
AB: We built a remote sensing method for leaf area index (LAI) and ground cover mosses / lichens in boreal forest by field component spectral observation and radiative transfer modeling based on the spectrum. The method was applied to evaluate annual net ecosystem productivity (NEP) distribution in boreal forest, interior Alaska by combining soil respiration observation synchronized to the spectral observation. Spectral reflectance and soil respiration were observed in two 30m X 30m plots in black spruce stands, central Alaska. Spectral characteristics of the forest floor and the needle leaves were used as input parameters of a radiative transfer model to evaluate nadir reflectances of spruce communities in relation to varying upper layer LAI, forest floor bryophyte types, and leaf spectral characteristics. Using the relationship, we obtained LAI and bryophyte area ratios for each pixel that corresponds to spruce forest on Landsat ETM+ imagery. The LAI-NPP relationship was estimated from Plonski's normal yield table data and specific leaf area, and NPP was calculated from LAI. Based on the observed annual soil respiration and NPP of upper layer and forest floor, annual NEP geographical distribution was estimated as a mean value in recent 30-100 years from remotely sensed LAI and forest floor bryophyte area ratios. The annually estimated NEP was 51 gC/m$^{2}$/year, which corresponds to the value (55 gC/m$^{2}$/year) of 150-year-old black spruce forest in the BOREAS study region, Canada.
DE: 0315 Biosphere/atmosphere interactions
DE: 1223 Ocean/Earth/atmosphere interactions (3339)
DE: 1615 Biogeochemical processes (4805)
DE: 1640 Remote sensing
DE: 1851 Plant ecology
SC: Biogeosciences [B]
MN: 2003 Fall Meeting